/**
 * Software License, Version 1.0
 *
 * Copyright 2003 The Trustees of Indiana University.  All rights reserved.
 *
 *
 *Redistribution and use in source and binary forms, with or without
 *modification, are permitted provided that the following conditions are met:
 *
 *1) All redistributions of source code must retain the above copyright notice,
 * the list of authors in the original source code, this list of conditions and
 * the disclaimer listed in this license;
 *2) All redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the disclaimer listed in this license in
 * the documentation and/or other materials provided with the distribution;
 *3) Any documentation included with all redistributions must include the
 * following acknowledgement:
 *
 *"This product includes software developed by the Community Grids Lab. For
 * further information contact the Community Grids Lab at
 * http://communitygrids.iu.edu/."
 *
 * Alternatively, this acknowledgement may appear in the software itself, and
 * wherever such third-party acknowledgments normally appear.
 *
 *4) The name Indiana University or Community Grids Lab or NaradaBrokering,
 * shall not be used to endorse or promote products derived from this software
 * without prior written permission from Indiana University.  For written
 * permission, please contact the Advanced Research and Technology Institute
 * ("ARTI") at 351 West 10th Street, Indianapolis, Indiana 46202.
 *5) Products derived from this software may not be called NaradaBrokering,
 * nor may Indiana University or Community Grids Lab or NaradaBrokering appear
 * in their name, without prior written permission of ARTI.
 *
 *
 * Indiana University provides no reassurances that the source code provided
 * does not infringe the patent or any other intellectual property rights of
 * any other entity.  Indiana University disclaims any liability to any
 * recipient for claims brought by any other entity based on infringement of
 * intellectual property rights or otherwise.
 *
 *LICENSEE UNDERSTANDS THAT SOFTWARE IS PROVIDED "AS IS" FOR WHICH NO
 *WARRANTIES AS TO CAPABILITIES OR ACCURACY ARE MADE. INDIANA UNIVERSITY GIVES
 *NO WARRANTIES AND MAKES NO REPRESENTATION THAT SOFTWARE IS FREE OF
 *INFRINGEMENT OF THIRD PARTY PATENT, COPYRIGHT, OR OTHER PROPRIETARY RIGHTS.
 *INDIANA UNIVERSITY MAKES NO WARRANTIES THAT SOFTWARE IS FREE FROM "BUGS",
 *"VIRUSES", "TROJAN HORSES", "TRAP DOORS", "WORMS", OR OTHER HARMFUL CODE.
 *LICENSEE ASSUMES THE ENTIRE RISK AS TO THE PERFORMANCE OF SOFTWARE AND/OR
 *ASSOCIATED MATERIALS, AND TO THE PERFORMANCE AND VALIDITY OF INFORMATION
 *GENERATED USING SOFTWARE.
 */

package cgl.narada.service.timer;

import org.apache.log4j.Logger;

import cgl.narada.util.SystemInit;
import cgl.narada.util.SystemNotInitializedException;

/**
 * HRClock wrapps Windows and Unix implementations and returns the client either
 * windows or unix implementation of the clock.
 * 
 * @author Hasan Bulut - hbulut@indiana.edu Community Grids Lab., Indiana
 *         University
 * @author Harshawardhan Gadgil (hgadgil@grids.ucs.indiana.edu)
 * @version 1.0
 */
public class HRClock extends ClockI {

    static Logger log = Logger.getLogger("HRClock");

    // ~ Instance fields
    // ----------------------------------------------------------

    private static ClockI instance = new HRClock();
    private static boolean initDone = false;

    private static String NB_HOME = null;
    private String libPath = NB_HOME + "/ext/windows/hrtimerwin.dll";
    private String OSName = "Windows"; // Linux, Windows, Solaris
    private String OSArch = "i386"; // Linux, Windows, Solaris
    private ClockI hrclock = null;

    // ~ Constructors
    // -------------------------------------------------------------

    /**
     * Generates a new HRClock object.
     */
    private HRClock() {}

    private void init() {

        // Allow only 1 init per JVM
        if (initDone)
            return;

        if (NB_HOME == null) {
            try {
                NB_HOME = SystemInit.getInitData(SystemInit.SYS_NB_HOME);
            } catch (SystemNotInitializedException e) {
                NB_HOME = "C:/NB/NaradaBrokering";
                log.error("", e);
                log.warn("Using NB_HOME: " + NB_HOME);
            }
        }

        OSName = System.getProperty("os.name");
        OSArch = System.getProperty("os.arch");
        
        System.out.println("os name:" + OSName);       
        
        if (OSName.toLowerCase().indexOf("windows") >= 0) {
            System.out.println("OSName:" + OSName);
            System.out.println("libPath:" + libPath);
            hrclock = WindowsClock.getClock();
        }

        else if ((OSName.toLowerCase().indexOf("linux") >= 0)
                || (OSName.toLowerCase().indexOf("sunos")) >= 0) {
            System.out.println("Unix clock, OSName:" + OSName);
            hrclock = UnixClock.getClock();
        }

        else {
            System.out.println("Unrecognized OS. "
                    + "\nUsing Java's default clock implementation " + OSName);
            hrclock = JavaClock.getClock();
        }

        initDone = true;
    }

    // ~ Methods
    // ------------------------------------------------------------------

    /**
     * Returns clock implementation for the underlying operating system.
     * 
     * @return ClockI - interface that has been implemented.
     */
    public static ClockI getClock() {
        ((HRClock) instance).init();
        return instance;
    }

    /**
     * Returns clock implementation for the underlying operating system.
     * 
     * @param nbHome -
     *            NB Home directory
     * @return ClockI - interface that has been implemented.
     */
    public static ClockI getClock(String nbHome) {
        NB_HOME = nbHome;
        ((HRClock) instance).init();
        return instance;
    }

    public static String getNBHome() {
        return NB_HOME;
    }

    /**
     * Returns time in microseconds
     * 
     * @return long - local time as microseconds
     */
    public long getTimeMicroseconds() {
        return hrclock.getTimeMicroseconds();
    }

    /**
     * Returns time in milliseconds
     * 
     * @return long - local time as milliseconds
     */
    public long getTimeMilliseconds() {
        return hrclock.getTimeMilliseconds();
    }

    /**
     * Causes thread to sleep for the specified amount in milliseconds.
     * 
     * @param sleepVal -
     *            sleep time in milliseconds
     */
    public void sleep(int sleepVal) {
        hrclock.sleep(sleepVal);
    }

    /**
     * Simple test program.
     * 
     * @param args -
     *            input arguments, no arguments used.
     */
    public static void main(String[] args) {
        /*
         * HRClock hr = new HRClock(); ClockI hrclock = hr.getClock(); long
         * tmsec = 0; long tusec = 0; int len = 10000; long [] arr = new
         * long[len];
         * 
         * //tmsec = hrclock.getTimeMilliseconds(); for (int i=0; i<len; i++) {
         * tusec = hrclock.getTimeMicroseconds(); arr[i] = tusec;
         * hrclock.sleep(2000); } // for (int i=0; i<len; i++) { //
         * System.out.println(arr[i]); // } //
         */
        // *
        int slpTime = 2000;
        if (args.length == 1) {
            slpTime = Integer.parseInt(args[0]);
        }
        System.out.println("slpTime:" + slpTime);

        // HRClock hr = new HRClock();
        ClockI hrclock = HRClock.getClock();
        long tmsec = 0;
        long tusec = 0;
        tmsec = hrclock.getTimeMilliseconds();
        // tmsec = hrclock.getTimeMicroseconds();
        hrclock.sleep(slpTime);
        tusec = hrclock.getTimeMicroseconds();
        System.out.println("msec: " + tmsec);
        System.out.println("usec: " + tusec);
        System.out.println("setting hrclock to null");
        try {
            Thread.sleep(10000);
        } catch (InterruptedException ex) {}
        hrclock = null;
        ClockI hrclock2 = HRClock.getClock();
        // */
    }
}
